Sintered body of silicon nitride and its manufacture

Details Sintered body of silicon nitride and its manufacture Sintered body of silicon nitride and its manufacture

1989-08-15

1991-09-03

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 97, 264 65, 264 66, 423344, C04B 3558

Patent

active

050455133

ABSTRACT:
A sintered body of silicon nitride with high density, strength, toughness, and hardness, which can be used for a structural part of an engine, etc. The sintered body of the invention includes 80 to 94 wt % Si.sub.3 N.sub.4, 2 to 10 wt % Mg compound calculated in MgO equivlent, and 2 to 10 wt % Y compound calculated in Y.sub.2 O.sub.3 equivalent. The Si.sub.3 N.sub.4 contains 5 to 40% .alpha.-phase. The sintered body is manufactured in the following steps: (a) mixing powdery Si.sub.3 N.sub.4 with a Mg compound and a Y compound in the above proportions, and then molding the mixture in which the Si.sub.3 N.sub.4 powder contains 80% or more .alpha.-phase and its grains are 1 .mu.m or less in diameter on average; (b) performing primary sintering at 1,600.degree. C. or less in an atmospher of nitrogen or of an inert gas at 20 atm or less; and (c) performing secondary sintering at 1,400.degree. to 1,600.degree. C. in an atmosphere of nitrogen or of an inert gas at 300 atm or more.

REFERENCES:
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patent: 4830991 (1989-05-01), Matsui et al.
patent: 4886767 (1989-12-01), Goto et al.
F. F. Lang, Dense Silicon Nitride Ceramics: Fabrication and Interrelations with Properties, pp. 597-613, Rockwell International Science Center.
G. Wotting and G. Ziegler, Dichtes Siliciumnitrid, II: Einflubfaktoren Bei der Herstellung und Gefugeentwicklung, Sprechsall, Fachberichte vol. 120, No. 2, 1987.
Hiroshi Horiguchi, Gosei Kaimenkasseizai (Synthetic Surfactants) published by Sankyo Syuppan K.K. (1962) (translation of Table of Contents).

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